Din 30crnimo8 Steel Pipe Welding Process Technical Points - China

din 30crnimo8 steel pipe welding method selection:

- manual arc welding (smaw), gas shielded welding (gmaw or fcaw) and other welding methods can be used.

manual arc welding is flexible and suitable for welding in various positions, but the welding efficiency is relatively low.

gas shielded welding has the advantages of high welding efficiency and good weld quality, and is particularly suitable for automated welding.

- for important structures or occasions with high requirements for weld quality, submerged arc welding (saw) can also be used, which has high weld quality and fast welding speed, but the equipment cost is high and the assembly accuracy requirements for welds are also high.

- **welding parameter setting**:

- **manual arc welding**: the electrode diameter is selected according to the wall thickness of the steel pipe, generally between 3.2 and 4.0mm.

the welding current is adjusted according to the electrode diameter and welding position.

the current can be between 120 and 160a for flat welding, and the current is appropriately reduced to about 100-140a for vertical welding.

the arc voltage is generally between 22 and 26v.

- **gas shielded welding**: the wire diameter is usually 1.2 - 1.6mm.

the welding current is between 200 - 300a, and the arc voltage is 24 - 30v.

the gas flow rate is determined according to factors such as the type of shielding gas and welding speed.

the argon flow rate is generally 15 - 20l/min, and the argon-carbon dioxide mixed gas flow rate is 20 - 25l/min.

- **welding sequence and direction**:

- for annular welds, segmented back welding or skip welding is generally used to reduce welding deformation.

the welding direction can be clockwise or counterclockwise, but it must be consistent throughout the welding process.

- for multi-layer and multi-pass welding, the interlayer temperature should be strictly controlled, and the interlayer temperature generally does not exceed 200℃.

the arc starting and arc ending positions of each layer of weld should be staggered to avoid welding defects concentrated in the same position.

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• Posted By: Dongguan Songshun Mould Steel Co., Ltd.

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